Machine drive and control therefor



March 3, 1942. H. HAu'rscH 2,274,958

MACHINE DRIVE AND CONTROL THEREFOR Filed May 15, 1940 2 sheets-sheet 1 rI 77 25 27 /f-: J/ v 7""9 72 30 l/ f/ I/ f 73 l m29 78 /1 c4: t

f8 47 1 2 y /nvenor #f7/v5 H1/7507A A/iorneys -Mmfi13,1942. H. HAUTSCH2,274,958

MACHINE DRIVE A ND CONTROL THEREFOR Filed May 15, 1940 2 sheets-sheet 2Patented Mar. 3, 1942 2,274,958 MACHINE DRIVE AND CONTROL THEBEFOR HansHautsch, Meuselwitz/Thur, Germany Application May 15, 1940, serial10,335,331

In Germany May 17, 1939@ s claims.

This invention refers to drives for machine tools, e. g. centre lathesor the like. It consists in a new and improved control device for suchdrives. and more particularly in a control mecha.-

nism which is oil-tight and allows a simple and foolproof operationthereof. l With such drives, the rotating power is transmitted forexample, either from change-wheel spindle over a cone of gears andtumbler gear or swing-gear to -an intermediate shaft, alternatively overthe intermediate shaft and swing-gear onto the cone of gears. Herewithvarious ratios can be put into operation by means of the swinggearcarrying intermediate gears, which swing gear can be slidcorrespondingly and axially on a countershaft and may be swung into gearwith the cone of gears.

The disadvantage with certain control mecha- A nisms for drives of thistype is that their manipulation is not simple enough, and that thecontrol levers do not permit the gear casing to be closed completely,and to be made dust and dirt proof. Lubrication with this method ofconstruction is imperfect, and dimculty is experienced in letting themechanism run totally oilimmersed.

This present invention appertains to an improved controlling device forsuch drives free from the aforementioned disadvantages; that is, itpermits a totally enclosed feed-box to be constructed-which in regard tostructure and operation is technically of such simple form that a longworking life is assured.

More in detail, the invention resides in providing two rotating memberson the front of the gear-box which members serve to set the swinggear,arranged slidably but non-rotatably on a countershaft, into itsindividual stages against the block: the rotation actuating shafts ofsaid members lead into the gear-box through oiltight bearings, and overintermediate gearing operate on the one hand, swivelling of thecountershaft, and on the other hand. sliding of the swing-gear n saidshaft.

Thus, due to the fact that the control of the swing-gear is controlledby a rotating motion even as regards the shifting thereof, no extrarecessing of the gear casing is necessary to make way for longitudinalmovements, whilst the sealing of said shafts entering the casing oiersno l'diiiliculties whatsoever.

The practical construction of this invention can be so arranged that theshafts within the casing are each fitted with a pinion, one of whichengages with a toothed rack connected tothe swing-gear shifter-fork. andthe other shaft.

and sun' further it is au object or this mvention to fit one ofthe twoshafts concentrically within each other, in order to obtain a compactand distinctive structure, utilizing the outer shaft, on which a longercontrol handle may be mounted to eect axial movement of the tumblergear.

The above and other characteristics of the invention will appear fromthe drawings which show a practical example of the invention and inwhich Fig. 1 is a front view (longitudinal section) of the completedrive. Y

Fig. 2 shows a side elevation, partly in section, of the arrangementaccording to invention, and

Figs. 3-5 illustrate individualities of the controlling mechanismaccording to invention.

Referring now to Fig. 1, I0 denotes the change wheel spindle, from whichthe rotation is transmitted,*either over cone of gears II and pinion I2to shaft I3, or over pinions I4, I5 to shaft I3, pinion I2, and thenceto cone `II on shaft II. Connection between cone II andpinion I2 is madeby means of a tumbler gear or swing-gear 2I mounted in tubular frame I8,which is slidable but` non-rotatable on countershaft I9, and whichcarries intermediate gear 20. Turning of shaft I9 allows this lattergear 2| to engage. with an appointed gear wheel of cone II, whilst theformer (20) engages with pinion I2.

In order to be able to move the swing-gear axially on countershaft I9,and to bring it into contact with block II, an arrangement conforming tothe invention as shown in Fig. 2 willhave to be fitted. VIn Fig. 2 thefront of gear casing 25 is shown tted with shaft 26 and a concentricallyarranged hollow shaft 21, together forming an oil-tight joint with thegear casing. Shaft 26 is tted with turn-knob 29, and shaft 21 isconnected to drum 30, e'. g. keyed, a'nd adjustable by means of handlever 3| to the respective wheels on block II through ball stops 34.

Turn-knob 29 and shaft 26 serve to swivel the swing-gear frame I8 towardand away from the block II, and for this purpose the shaft is fitted onthe inside of the gear casing with pinion 3 6 that meshes, as shown inside elevation Fig. 3 and plan view Fig. 4, with pinion 31. Spindle 38of pinion 31, also located within the gear casing, is fitted with worm39 that meshes with wormwheel segment 40 on shaft I9.

' According Ato the direction rotation of turnknob :s the cuntersnaft lsis turned in one or the other direction, and therewithv swing-gear frameI8 on this shaft is brought toward or away from cone II. Whenapproaching the swing-gear to the cone the extent of its swivellingmotion is determined by stops 45 (Figs. 2 and 5) attributed to theindividual wheels on block II, and which can for example be adjusted byscrews.

From Fig. 2 it may be seen that in order to shift swing-gear element I8axially on countermechanism operated by' turn-knob 29 so that aleft-hand rotation disengages, and a right-handy rotation engages theswing-gear. Now when it is desired to engage the drive with a certainratio. knob 29 must first be turned to the left; then, the desired gearis set with lever 3|, and a righthand turn of knob 29 re-engages theswing-gear.

What I claim is:

l. In a drive for a machine tool or the like, a tumbler shaft and atumbler gear frame splined thereon, control means for the tumbler gearcomprising a lever and a knob respectively 'mounted vupon outer andinner concentric shafts,

a shifter element engaging said tumbler gear frame for effectingtranslation of the latter axially upon said tumbler shaft, said shifterelement comprising a rack geared to the outer of said concentric shafts,and the inner of said concentric shafts being geared to said tumblershaft for effecting rotative motion thereof, whereby turning of the knobwill eiIect rotative transla tion of the tumbler gear frame' and turningof the lever will effect translation thereof .axially of the tumblershaft.

2. In a drive for a -machinetool or the like, a tumbler shaft and atumbler gear frame mounted thereon for rotative movement therewith,control means for the tumbler gear comprising outer and inner concentricshafts, a shifter element mounted for movement on a guide substantiallyparallel to the .tumbler shaft, said shifter element engaging a partcarried ,by the frame for effectingtranslation of the latter along theaxis of the tumbler shaft, said shifter element comprising a rack gearedto the outer of said concentric shafts, and the inner of said concentricshafts being geared to said tumbler shaft for effecting rotativemovement of the latter.

3. In a drive for a machine tool or the like. a cone of gears and atumbler gear for meshing engagement therewith, a tumbler shaft and aframe for the tumbler gear mounted on said shaft for rotative movementtherewith, stop means and a part of said frame engageable therewith forlimiting the degree of movement of the tumbler gear about the axis ofthe tumbler shaft into meshing engagement with the gears of said cone,control means for the tumbler gear comprising inner and outer concentricshafts, the inner of said concentric shafts being geared to the tumblershaft to effect rotational movement of the latter, and a shifter elementmounted for movement on a guide substantially parallel to the tumblershaft, said shifter element having a rack geared to the outer of saidconcentric shafts and engaging a part carried by the frame for effectingtranslation of the latter along the' axis of the tumbler shaft.

HANS HAUTSCH.

CERTIFICATE OF CORRECTION.

pater@ No. 2,27h,958. narch 5, 19h2.

HANS HAUTSCH.

It is hereby certified that error appears in the printed specificationof theabove numbered patent requiring correctionas follows: Page l,4secondcolumn, line 28, for "tubular" read tumb1er; and line 55, after"direction" insert`ofg and that the said Letters Patent shouldbe readwith this correction therein that the same may conform to the record 0fthe case in the Patent Office. V

Signed areealed this 28th day ofApril, A. D. 1914.2.

. Henry Van Arsda1e, I (Seal) A Acting Commissioner of Patents.

